Boring-jig.



PATENTED'JUNEZ, 1908.

A. W. THOMAS.

BORING JIG. l APPLICATION FILED 00T. 10, 1906.

ALBION W. THOMAS, OF ROME, NEW YORK.

BORING-Jie.

Specification of Letters Patent.A

Patented June 2,1908.

Application led October 10, 1906. Serial No. 388,199.

To all whom it 'may concern.'

`Be it known that I, ALBION W. THOMAS, a citizen of the United States,residing at Rome, in the county ofOneida and State of New York, haveinvented certainnew and useful Improvements in Boring-Jigs, of whichthey following is a speciiication, reference being had therein to theaccompanying drawing.

My invention relates to an im lroved boring jig, and I declare that thefo lowing is a full, clear, concise and exact description thereofsufficient to enable one skilled in the .art to make and use the same,reference being had to the accompanying drawings in which like lettersand numerals refer to like parts throughout.

The -purpose of the invention is to provide a means by which a mechaniccan insure the boring of a hole at a right or oblique angle and can alsoinsure that the holes bored fromI opposite sides will by reason of suchangles being iixed, exactly meet, and the vvarious utilities or' thedevice will be apparent to any skilled mechanic. l

The device comprises a standard which supports a barrel by trunnions',the barrel be. ing adapted to receive gages of diilerent sizes accordingto the bit to be used. The

fbarrel and the gages are centrally bored so that the bit passes throughthe gage which is mounted in the barrel and establishes and 'maintainsthe direction of the hole to be.

bored.

In the drawings, Figure 1 is aperspective view; Fig. 2 is a partial sideview;` Fig. 3 is-a vertical sectional view ofthe device, and Fig.

- '4 is a partial sectional view at right angles to Fig. 3, while Fig. 5is aview of some gages to be supported in the barrel. Fig. 6 is a paratial cross-section view in detail ofthe nested gages.

Referring to the figures more in detail, 1

re resents a frame having a rinl like base 2 with vertical standards 3.On t ese standardsis mounted a barrel or sleeve 4 by trunnions 5 andbolts 6, one of which is a thumbscrew to turn the barrel on thestandards 3.. This latter bolt 6 extends simply -through the standard 3and into the trunnion, but the one on the side, though either may beadapted for the purpose, passes through the trunnion and the barrel asufficient distance to engage the inside or smallest gage by friction ofthe bolt 6 to hold it in place, the other gages being likewise held bythe bolt, as will be seen. The gages are indicated by 7 and comprise aseries of cylinders, each smaller fitting into the next larger and thegages being of such size that the smallest in .this instance is aquarter of an inch, the gages increasing by eighths and the largestgage, which is the baritself, is an inch in diameter. The top of thebarrel is cut out as indicated at 8, and each gage has an overlappingedge 9 so that they are su' orted in a nest on the top of the barrel.the gages, except the innermost one, have a longitudinal slot. 10 withside-cut 1 1 which is rovided for the passage of the bolt 6 theret roughto its rictional contact with the innermost gage, the intermediate gagesbeing slip ed down over the bolt and turned so as to e held in position.When one ofthe slotted gages is to be used the bolt 6 is unscrewed so asto leave the bore of the gage clear.

On -one side ofthe device the trunnion has integral or mounted thereon agraduate dial 12 and the corresponding side piece of the frame has anupward extended arrow or needle 13. The purpose'of this device is topermit the mechanic to measure the angle and "maintain it in differentpieces of work.- On

one side of the barrel is mounted or integrally cast a case 14 which isbored .at right angles to the bore of the barrel.` This case is boredout and a level inserted therein comprising a brass tube 15 with glass16 therein, the tube having slightlyprojecting thumb-pieces .17 so thatit-can be turned to protect the glass by the wall of the outer casingwhen the level is not in use. The end of the casing is screwthreaded ashort distance-andthe outer wall of the tube is also screwthreaded sothat thetube is held iii ythe casing thereby. I provide also meansfor'limiting the depth of the bore. This comprises two arms 18 slottedaty 19 and supported on the `barrel by thumb-screws 20 and supporting attheir to the ring 21. The height of the ring is a )usted so that contactof the brace grip with the ring limits the depth of the bore made by thebit, the thumb-screws permitting adjust-` ment of the ring as desireSince the barrel may be tilted at such angle that its axial line wouldstrike the base part 2, this latter art has a cut-out on one side asshown at 2a 1n Fig. 1.

In orderl to provide a stable mounting for the device I provide a rubberring 24 constructed to lap over rin 2 and having on its underside nubs25 where y the device is held on a surface without marringsthe surfaceor 1. In a device ofthe character described, a-

frame comprised of a base and vertical standards, a barrel trunnioned atthe end of the standards, and` a tubular gage removably supported in thebarrel With its axis coincident with the axis of the barrel.-

2. In a device of the character described, an annular base havingoppositely disposed vertical standards, a barrel mounted on thestandards by means of trunnions, one of the trunnions having a graduatedial and one of the standards having an index finger adjacent the dial,substantially as shown.-

3. In a device of the character described, a standard, a barrel, gagessupported in the barrel and means supporting the barrel on the standardand the gages in the barrel, substantially as shown. I

4. In adevice ofthe character described, a

barrel axially bored for the passage of a borl ing tool therethrough,the barrel having mounted` therein a plurality of gages and meanssecuring the gages in the barrel, the said gages being cut out for theentry of said securing means to abut against the Wall of the innermostgage, substantially as shown.

5. In a device of the character described, a sWingably mounted barrel,and `a nest of interitting guides, the outermost being supported on thebarrel 'and each successive inner one supported on the next Outer one,the said guides being severally of a length adapted 'to control thedirection of a boring tool passed therethrough, substantially asdescribed.

6. In a device of the character described, a tool-guiding meanscomprising a frame with vertical standards, a guiding barrel trunnionedon the standards, in combination with a guard mounted on the barrel andadjustable lengthwise thereof to limit,the depth of the tool bore,substantially as described. 7. In a boring gage, a standard, atoolvguiding means swingably mounted thereon at a point substantiallydistant from the Work to be bored, extensible means adjustably mountedthereon to limit the boredepth of a tool and means for measuring theangle'of the bore, by the combination of Which means the direction anddepth of a plurality of holes may be standardized.

8. In a device of the character described, a barrel and a plurality oftool-guides nested therein, each guide having an exterior annulus and aninterior annular cut-out at one end and the end of the barrel havingsuch cut-out, and means for retaining the nest of' guides in the barrel.

In testimony whereof I affix my signature in presence of tWO Witnesses.

ALBION W. THOMAS. Witnesses:

E. T. DE GIORQI, E. E. RIsLEY..

